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Vent Opening Size and Construction - Forno Bravo Forum: The Wood-Fired Oven Community

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I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

Ask Me Anything New Forum Feature

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Vent Opening Size and Construction

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  • Vent Opening Size and Construction

    I am starting to think ahead to the vent design and construction and have a few questions and I can't find the answers in other threads.

    First, is there a vent opening size ratio? In other words, if I am building a 42" high dome oven (and I am) and use the opening size of 20"x12.5" as recommended, do I need a vent opening size of ? square inches?

    Second, if I opt for the concrete vent construction do you need a special concrete mix or just basic concrete mix?

    Thanks in advance

  • #2
    Re: Vent Opening Size and Construction

    I think you take the square inches of the inner arch and use 10% of that for your vent opening. Just as your inner arch height is 63% of the dome height (the so called golden mean). As far as planning ahead, think of the inner arch. I think the whole dome is built around it.

    Good Luck

    Tom

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    • #3
      Re: Vent Opening Size and Construction

      That does not sound right to me. by your calculation that would be 250 square inches of the opening (if rectangle and not arched) 10% is 25 sq inches of vent so that is like a 5"x 5" opening? I'm no expert but that sounds small to me.

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      • #4
        Re: Vent Opening Size and Construction

        Originally posted by lhuhn View Post
        Second, if I opt for the concrete vent construction do you need a special concrete mix or just basic concrete mix?
        Yes, you need to use refractory cement mix as the vent gets extremely hot.

        I designed and molded my vent using Rutland castable refractory cement.
        George

        My 34" WFO build

        Weber 22-OTG / Ugly Drum Smoker / 34" WFO

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        • #5
          Re: Vent Opening Size and Construction

          Yes, you shouldn't use portland concrete for your vent transition. Way too hot.
          My geodesic oven project: part 1, part 2

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          • #6
            Re: Vent Opening Size and Construction

            The 10% ROT is for fireplace openings/flue size, but the same principle applies. It is always better to err on the side of larger, though.

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